All jokes aside let me give you a simple answer. As someone who has trained in the Bujinkan (Ninjutsu) I would not advise you to do so unless you find a good club. The system has alot of problems. I won't go into the politics but basically most Bujinkan dojo's don't train in a realistic manner. That is they don't do any sparring or alive practice.

Check out those 2 Bujinkan schools near you. Talk to the instructors.

If the training is not physically demanding and does not challenge your fitness, leave.
If they don't do any sparring, leave.

When looking for a decent martial arts school the rule of thumb is of they train hard and fight hard ( plenty of sparring), they are good. Your full contact competition styles do this.

well USUALLY kempo usues pressure point and kenpo doesnt. Kempo is okinawan and Kempo is american, and MOST obvious, one has an N and one has a M. And from past experiences Kempo is more hardcore then Kenpo. but hey, i only know what I know and only seen when I seen